It'll be interesting how Obama deals with questions about Iran and what the redline is for their nuclear program. Cause as chief strategist for the US, his best option is to not answer the question, because it's subject to negotiation and he shouldn't give away his hand. But as a candidate and as the leader of a democracy, he's sort of obligated to answer.
I'd duck it with some pablum about how the first priority is to assure the safety of the United States and its ally Israel, that we're open to different approaches that would satisfy that, and that we shouldn't set preconditions when we still have to get key NATO/Security Council countries on board in order to make sure any deal is enforceable.